The tag implication #46611 blue_dragon_slug -> nudibranch has been rejected.
Reason: https://en.wikipedia.org/wiki/Glaucus_atlanticus
Glaucus atlanticus (...) is a species of small, blue sea slug, a pelagic (open-ocean) aeolid nudibranch, a shell-less gastropod mollusk in the family Glaucidae.
EDIT: The tag implication glaucus_atlanticus -> nudibranch (forum #342615) has been approved by @bitWolfy.
Updated by auto moderator